I was trying to have a counter in the shape of jLabel on the JFrame that increases its value automatically .
My purpose was to mimic a heart rate of a person so that I would follow further operations based on this value. I created an arrayList and made it full of integer heart rate values previously recorded in a txt file. By using SwingWorker class defined in this example, I was able to get an integer from the list, send it (by publish function) and catch it on the air and write it into label. By this way I had an application that shows me the hearRate of a person as if it is in real time.
Check this Flipper example.